My head unit only has 2RCA Outputs, so for that we installed an Equalizer so i can control the Sub in the back. The Equalizer output is 12V to the Amp.

So my problem is that after 40-50 minutes of listening to music, the Amp just shuts down even though it's not hot, it's very mildly warm.
I have to turn off my car for 3-5 hours before the speakers will work again.

Last night i was tampering with the Shutoff Fuse in the bonnet just tapping it and the battery leads, and my audio just came back on, but i think it was just a coincidence.

Also since this problem started, my car radio is changing between using the AUX Output (mp3 player) and Radio mode by it's self.